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Hi Harold,
I would recommend you to make a call to your ISP (Internet Service Provider) and tell them you have a router that needs to be configured, therefore they will send a network specialist to assist you on this matter.

Briefly NAT stands for Network Address Translation that simply hides private address and translate them into public addresses to communicate with internet, hence if you have a router with NAT enabled, global users from internet won't see your PC IP address, but the router public one, it could be a static or dynamic, so basically the IP address of each packet that enters and leaving through the router are constantly translated from public to private and vice-versa, something like a border controller. SPI is a network firewall stands for Statefull Packet Inspection that provide deep checks of the traffic packets going through the router like filtering, but depends how it is configured. I'll suggest you some simple router with NAT, you don't need a router with a lot of features as they require a good network knowledge to be configured properly and also are more expensive.

Hi,
Is it something like https://forum.kaspersky.com/index.php?/topic/368799-network-attack-udp-attack-to-port-1434/ ? If it is, it means nothing to worry about. UDP port 1434 isn't listening for connection, since it's used for SQL server, if you don't have it configured, in addition network attack blocker is doing a good job. Anyway, if you want to feel more safe, you can block the attacking IP addresses into the firewall. Like whizard mentioned, no worries and use some router if you don't have, since NAT/SPI are helpful in such cases, as I didn't had during the attacks.

Hi De_Haos, I had CPU/disk usage problem before and that could be caused by many things and most of them are application, virus or just performance issues (e.g full "C", not enough memory, etc.). It's not a secret that KL is a bit heavy, but I'm still using it on my 7 years old laptop and my VM on it as well, and can't even notice it's working whilst full scanning. If KL has some additional running "exe" file that causes such issues, we also should have had experienced the same thing (as I had with Mozilla long time ago). Have you checked in the task manager which specific file can cause such disturbance? Are you sure you don't have virus? Are you sure your system is okay overall?
Best regards

Hello,
For such purposes several years ago I bought KIS with license for 3 devices (my laptop, VM and smartphone). As I know for home products KL offers licenses that could be used on 5 devices, but I'm not aware for more than that.
best regards